Substrate for a semiconductor device



FIG. 1 is a top plan view of a substrate for a semiconductor device, showing my new design; the opposite side being a mirror image thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof; the opposite side being a mirror image thereof; and,

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a substrate for a semiconductor device, as shown and described. 